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Please note: This text was taken directly from the manufacturer.
With refractors, it's normal to see some purple fringing or halos around bright objects such as the planets, Moon, and bright stars. Such false color, or chromatic aberration, results from the inability of a standard two-element ("achromatic") lens assembly to focus all wavelengths of light to a single point. The effect is particularly pronounced at higher powers. But if you are the type that thinks halos look better on angels than on astronomical objects, then our V-Block filter is for you. It effectively removes the distracting color halos from around bright objects, greatly improving image sharpness, color, contrast, and resolution.
